telnetsrv.c 26 KB
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/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
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 * the OAI Public License, Version 1.1  (the "License"); you may not use this file
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 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

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/*! \file common/utils/telnetsrv/telnetsrv.c
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 * \brief: implementation of a telnet server
 * \author Francois TABURET
 * \date 2017
 * \version 0.1
 * \company NOKIA BellLabs France
 * \email: francois.taburet@nokia-bell-labs.com
 * \note
 * \warning
 */
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <pthread.h>
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#include "telnetsrv.h"
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#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <dlfcn.h>
#include <sys/time.h>
#include <sys/resource.h>
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#include "common/utils/load_module_shlib.h"
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#include "common/config/config_userapi.h"
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#include <readline/history.h>
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#include "telnetsrv_phycmd.h"
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#include "telnetsrv_proccmd.h"
static char *telnet_defstatmod[] = {"softmodem","phy","loader"};
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static telnetsrv_params_t telnetparams;
#define TELNETSRV_LISTENADDR 0
#define TELNETSRV_LISTENPORT 1
#define TELNETSRV_PRIORITY   2
#define TELNETSRV_DEBUG      3
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#define TELNETSRV_LOOPC      4
#define TELNETSRV_LOOPD      5
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#define TELNETSRV_HISFILE    6
#define TELNETSRV_HISSIZE    7
#define TELNETSRV_PHYBSIZE   8
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#define TELNETSRV_STATICMOD  9
#define TELNETSRV_SHRMOD     10

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paramdef_t telnetoptions[] = {
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  /*--------------------------------------------------------------------------------------------------------------------------------------------------------------------*/
  /*                                            configuration parameters for telnet utility                                                                             */
  /*   optname                     helpstr                paramflags           XXXptr                               defXXXval               type                 numelt */
  /*--------------------------------------------------------------------------------------------------------------------------------------------------------------------*/
  {"listenaddr",    "<listen ip address>\n",         0,                 uptr:&telnetparams.listenaddr,        defstrval:"0.0.0.0",            TYPE_IPV4ADDR,  0 },
  {"listenport",    "<local port>\n",                0,                 uptr:&(telnetparams.listenport),      defuintval:9090,                TYPE_UINT,      0 },
  {"priority",      "<scheduling policy (0-99)\n",   0,                 iptr:&telnetparams.priority,          defuintval:0,                   TYPE_INT,       0 },
  {"debug",         "<debug level>\n",               0,                 uptr:NULL,                            defuintval:0,                   TYPE_UINT,      0 },
  {"loopcount",     "<loop command iterations>\n",   0,                 uptr:&(telnetparams.loopcount),       defuintval:10,                  TYPE_UINT,      0 },
  {"loopdelay",     "<loop command delay (ms)>\n",   0,                 uptr:&(telnetparams.loopdelay),       defuintval:5000,                TYPE_UINT,      0 },
  {"histfile",      "<history file name>\n",         PARAMFLAG_NOFREE,  strptr:&(telnetparams.histfile),      defstrval:"oaitelnet.history",  TYPE_STRING,    0 },
  {"histsize",      "<history sizes>\n",             0,                 iptr:&(telnetparams.histsize),        defuintval:50,                  TYPE_INT,       0 },
  {"phypbsize",     "<phy dump buff size (bytes)>\n",0,                 uptr:&(telnetparams.phyprntbuff_size),defuintval:65000,               TYPE_UINT,      0 },
  {"staticmod",     "<static modules selection>\n",  0,                 strlistptr:NULL,                      defstrlistval:telnet_defstatmod,TYPE_STRINGLIST,(sizeof(telnet_defstatmod)/sizeof(char *))},
  {"shrmod",        "<dynamic modules selection>\n", 0,                 strlistptr:NULL,                      defstrlistval:NULL,TYPE_STRINGLIST,0 }
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};

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int get_phybsize(void) {
  return telnetparams.phyprntbuff_size;
};
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int add_telnetcmd(char *modulename,telnetshell_vardef_t *var, telnetshell_cmddef_t *cmd );
int setoutput(char *buff, int debug, telnet_printfunc_t prnt);
int setparam(char *buff, int debug, telnet_printfunc_t prnt);
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int history_cmd(char *buff, int debug, telnet_printfunc_t prnt);
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telnetshell_vardef_t telnet_vardef[] = {
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  {"debug",TELNET_VARTYPE_INT32,&telnetparams.telnetdbg},
  {"prio",TELNET_VARTYPE_INT32,&telnetparams.priority},
  {"loopc",TELNET_VARTYPE_INT32,&telnetparams.loopcount},
  {"loopd",TELNET_VARTYPE_INT32,&telnetparams.loopdelay},
  {"phypb",TELNET_VARTYPE_INT32,&telnetparams.phyprntbuff_size},
  {"hsize",TELNET_VARTYPE_INT32,&telnetparams.histsize},
  {"hfile",TELNET_VARTYPE_STRING,&telnetparams.histfile},
  {"",0,NULL}
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};

telnetshell_cmddef_t  telnet_cmdarray[] = {
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  {"redirlog","[here,file,off]",setoutput},
  {"param","[prio]",setparam},
  {"history","[list,reset]",history_cmd},
  {"","",NULL},
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};


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void client_printf(const char *message, ...) {
  va_list va_args;
  va_start(va_args, message);

  if (telnetparams.new_socket > 0) {
    vsnprintf(telnetparams.msgbuff,sizeof(telnetparams.msgbuff)-1,message, va_args);
    send(telnetparams.new_socket,telnetparams.msgbuff , strlen(telnetparams.msgbuff), MSG_NOSIGNAL);
  } else {
    vprintf(message, va_args);
  }

  va_end(va_args);
  return ;
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}

#define NICE_MAX 19
#define NICE_MIN -20
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void set_sched(pthread_t tid, int pid, int priority) {
  int rt;
  struct sched_param schedp;
  int policy;
  char strpolicy[10];

  //sched_get_priority_max(SCHED_FIFO)
  if (priority < NICE_MIN) {
    policy=SCHED_FIFO;
    sprintf(strpolicy,"%s","fifo");
    schedp.sched_priority= NICE_MIN - priority ;

    if (   (schedp.sched_priority < sched_get_priority_min(SCHED_FIFO)) ||
           (schedp.sched_priority > sched_get_priority_max(SCHED_FIFO)) ) {
      client_printf("Error: %i invalid prio, should be %i to %i, \n",
                    priority, NICE_MIN -sched_get_priority_min(SCHED_FIFO),
                    NICE_MIN - sched_get_priority_max(SCHED_FIFO) );
    }
  } else if (priority > NICE_MAX) {
    policy=SCHED_IDLE;
    sprintf(strpolicy,"%s","idle");
    schedp.sched_priority=0;
  } else {
    policy=SCHED_OTHER;
    sprintf(strpolicy,"%s","other");
    schedp.sched_priority=0;
  }
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  if( tid != 0) {
    rt = pthread_setschedparam(tid, policy, &schedp);
  } else if(pid > 0)  {
    rt = sched_setscheduler( pid, policy,&schedp);
  } else {
    rt= -1;
    client_printf("Error: no pid or tid specified\n");
  }

  if (rt != 0) {
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    client_printf("Error %i: %s modifying sched param to %s:%i, \n",
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                  errno,strerror(errno),strpolicy,schedp.sched_priority);
  } else  {
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    client_printf("policy set to %s, priority %i\n",strpolicy,schedp.sched_priority);
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    if ( policy==SCHED_OTHER) {
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      rt = getpriority(PRIO_PROCESS,tid);

      if (rt != -1) {
        rt = setpriority(PRIO_PROCESS,tid,priority);

        if (rt < 0) {
          client_printf("Error %i: %s trying to set nice value of thread %u to %i\n",
                        errno,strerror(errno),tid,priority);
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        }
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      } else {
        client_printf("Error %i: %s trying to get nice value of thread %u \n",
                      errno,strerror(errno),tid);
      }
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    }
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  }
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  if ( policy == SCHED_OTHER) {
    if ( tid > 0 && tid != pthread_self()) {
      client_printf("setting nice value using a thread id not implemented....\n");
    } else if (pid > 0) {
      errno=0;
      rt = setpriority(PRIO_PROCESS,pid,priority);
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      if (rt != 0) {
        client_printf("Error %i: %s calling setpriority, \n",errno,strerror(errno));
      } else {
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        client_printf("nice value set to %i\n",priority);
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      }
    }
  }
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}

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void set_affinity(pthread_t tid, int pid, int coreid) {
  cpu_set_t cpuset;
  int rt;
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  CPU_ZERO(&cpuset);
  CPU_SET(coreid, &cpuset);
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  if (tid > 0) {
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    rt = pthread_setaffinity_np((pthread_t)tid, sizeof(cpu_set_t), &cpuset);
  } else if (pid > 0) {
    rt = sched_setaffinity((pid_t)pid, sizeof(cpu_set_t), &cpuset);
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  } else {
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    rt= -1;
  }

  if (rt != 0) {
    client_printf("Error %i: %s calling , xxx_setaffinity...\n",errno,strerror(errno));
  } else {
    client_printf("thread %i affinity set to %i\n",(pid==0)?(int)tid:pid,coreid);
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  }
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}
/*------------------------------------------------------------------------------------*/
/*
function implementing telnet server specific commands, parameters of the
telnet_cmdarray table
*/

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void redirstd(char *newfname,telnet_printfunc_t prnt ) {
  FILE *fd;
  fd=freopen(newfname, "w", stdout);
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  if (fd == NULL) {
    prnt("ERROR: stdout redir to %s error %s",strerror(errno));
  }
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  fd=freopen(newfname, "w", stderr);
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  if (fd == NULL) {
    prnt("ERROR: stderr redir to %s error %s",strerror(errno));
  }
}
int setoutput(char *buff, int debug, telnet_printfunc_t prnt) {
  char cmds[TELNET_MAX_MSGLENGTH/TELNET_CMD_MAXSIZE][TELNET_CMD_MAXSIZE];
  char *logfname;
  char stdout_str[64];
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#define LOGFILE "logfile.log"
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  memset(cmds,0,sizeof(cmds));
  sscanf(buff,"%9s %32s %9s %9s %9s", cmds[0],cmds[1],cmds[2],cmds[3],cmds[4]  );

  if (strncasecmp(cmds[0],"here",4) == 0) {
    fflush(stdout);
    sprintf(stdout_str,"/proc/%i/fd/%i",getpid(),telnetparams.new_socket);
    dup2(telnetparams.new_socket,fileno(stdout));
    //   freopen(stdout_str, "w", stdout);
    //   freopen(stdout_str, "w", stderr);
    dup2(telnetparams.new_socket,fileno(stderr));
    prnt("Log output redirected to this terminal (%s)\n",stdout_str);
  }

  if (strncasecmp(cmds[0],"file",4) == 0) {
    if (cmds[1][0] == 0)
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      logfname=LOGFILE;
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    else
      logfname=cmds[1];

    fflush(stdout);
    redirstd(logfname,prnt);
  }

  if (strncasecmp(cmds[0],"off",3) == 0) {
    fflush(stdout);
    redirstd("/dev/tty",prnt);
  }

  return CMDSTATUS_FOUND;
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} /* setoutput */

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int setparam(char *buff, int debug, telnet_printfunc_t prnt) {
  char cmds[TELNET_MAX_MSGLENGTH/TELNET_CMD_MAXSIZE][TELNET_CMD_MAXSIZE];
  memset(cmds,0,sizeof(cmds));
  sscanf(buff,"%9s %9s %9s %9s %9s", cmds[0],cmds[1],cmds[2],cmds[3],cmds[4]  );

  if (strncasecmp(cmds[0],"prio",4) == 0) {
    int prio;
    prio=(int)strtol(cmds[1],NULL,0);
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    if (errno == ERANGE)
      return CMDSTATUS_VARNOTFOUND;
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    telnetparams.priority = prio;
    set_sched(pthread_self(),0,prio);
    return CMDSTATUS_FOUND;
  }

  if (strncasecmp(cmds[0],"aff",3) == 0) {
    int aff;
    aff=(int)strtol(cmds[1],NULL,0);

    if (errno == ERANGE)
      return CMDSTATUS_VARNOTFOUND;

    set_affinity(pthread_self(),0,aff);
    return CMDSTATUS_FOUND;
  }
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  return CMDSTATUS_NOTFOUND;
} /* setparam */

int history_cmd(char *buff, int debug, telnet_printfunc_t prnt) {
  char cmds[TELNET_MAX_MSGLENGTH/TELNET_CMD_MAXSIZE][TELNET_CMD_MAXSIZE];
  memset(cmds,0,sizeof(cmds));
  sscanf(buff,"%9s %9s %9s %9s %9s", cmds[0],cmds[1],cmds[2],cmds[3],cmds[4]  );

  if (cmds[0] == NULL)
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    return CMDSTATUS_VARNOTFOUND;
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  if (strncasecmp(cmds[0],"list",4) == 0) {
    HIST_ENTRY **hist = history_list();

    if (hist) {
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      for (int i = 0; hist[i]; i++) {
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        prnt ("%d: %s\n", i + history_base, hist[i]->line);
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      }
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    }

    return CMDSTATUS_FOUND;
  }

  if (strncasecmp(cmds[0],"reset",5) == 0) {
    clear_history();
    write_history(telnetparams.histfile);
    return CMDSTATUS_FOUND;
  }

  return CMDSTATUS_NOTFOUND;
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} /* history_cmd */
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/*-------------------------------------------------------------------------------------------------------*/
/*
generic commands available for all modules loaded by the server
*/

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int setgetvar(int moduleindex,char getorset,char *params) {
  int n,i;
  char varname[TELNET_CMD_MAXSIZE];
  char *varval=NULL;
  memset(varname,0,sizeof(varname));
  n = sscanf(params,"%s %ms",varname,&varval);

  for ( i=0 ; telnetparams.CmdParsers[moduleindex].var[i].varvalptr != NULL ; i++) {
    if ( strncasecmp(telnetparams.CmdParsers[moduleindex].var[i].varname,varname,strlen(telnetparams.CmdParsers[moduleindex].var[i].varname)) == 0) {
      if (n > 0 && (getorset == 'g' || getorset == 'G')) {
        client_printf("%s, %s = ", telnetparams.CmdParsers[moduleindex].module,
                      telnetparams.CmdParsers[moduleindex].var[i].varname );

        switch(telnetparams.CmdParsers[moduleindex].var[i].vartype) {
          case TELNET_VARTYPE_INT32:
            client_printf("%i\n",*(int32_t *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          case TELNET_VARTYPE_INT64:
            client_printf("%lli\n",*(int64_t *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          case TELNET_VARTYPE_INT16:
            client_printf("%hi\n",*(short *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          case TELNET_VARTYPE_DOUBLE:
            client_printf("%g\n",*(double *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          case TELNET_VARTYPE_STRING:
            client_printf("\"%s\"\n",*(char **)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          default:
            client_printf("unknown type\n");
            break;
        }
      }

      if (n > 1 && (getorset == 's' || getorset == 'S')) {
        client_printf("%s, %s set to \n", telnetparams.CmdParsers[moduleindex].module,
                      telnetparams.CmdParsers[moduleindex].var[i].varname);

        switch(telnetparams.CmdParsers[moduleindex].var[i].vartype) {
          case TELNET_VARTYPE_INT32:
            *(int *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr) = (int)strtol(varval,NULL,0);
            client_printf("%i\n",*(int *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          case TELNET_VARTYPE_INT16:
            *(short *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr) = (short)strtol(varval,NULL,0);
            client_printf("%hi\n",*(short *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          case TELNET_VARTYPE_DOUBLE:
            *(double *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr) = strtod(varval,NULL);
            client_printf("%g\n",*(double *)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          case TELNET_VARTYPE_STRING:
            sprintf(*(char **)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr),"%s", varval);
            client_printf("\"%s\"\n",*(char **)(telnetparams.CmdParsers[moduleindex].var[i].varvalptr));
            break;

          default:
            client_printf("unknown type\n");
            break;
        }
      }
    }
  }

  if (n>1 && varval != NULL) {
    free(varval);
  }

  return CMDSTATUS_VARNOTFOUND;
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}
/*----------------------------------------------------------------------------------------------------*/
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char *get_time(char *buff,int bufflen) {
  struct tm  tmstruct;
  time_t now = time (0);
  strftime (buff, bufflen, "%Y-%m-%d %H:%M:%S.000", localtime_r(&now,&tmstruct));
  return buff;
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}

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int process_command(char *buf) {
  int i,j,k;
  char modulename[TELNET_CMD_MAXSIZE];
  char cmd[TELNET_CMD_MAXSIZE];
  char cmdb[TELNET_MAX_MSGLENGTH];
  char *bufbck;
  int rt;
  memset(modulename,0,sizeof(modulename));
  memset(cmd,0,sizeof(cmd));
  memset(cmdb,0,sizeof(cmdb));

  if (strncasecmp(buf,"ex",2) == 0)
    return CMDSTATUS_EXIT;

  if (strncasecmp(buf,"help",4) == 0) {
    for (i=0; telnetparams.CmdParsers[i].var != NULL && telnetparams.CmdParsers[i].cmd != NULL; i++) {
      client_printf("   module %i = %s:\n",i,telnetparams.CmdParsers[i].module);

      for(j=0; telnetparams.CmdParsers[i].var[j].varvalptr != NULL ; j++) {
        client_printf("      %s [get set] %s <value>\n",
                      telnetparams.CmdParsers[i].module, telnetparams.CmdParsers[i].var[j].varname);
      }

      for(j=0; telnetparams.CmdParsers[i].cmd[j].cmdfunc != NULL ; j++) {
        client_printf("      %s %s %s\n",
                      telnetparams.CmdParsers[i].module,telnetparams.CmdParsers[i].cmd[j].cmdname,
                      telnetparams.CmdParsers[i].cmd[j].helpstr);
      }
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    }
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    return CMDSTATUS_FOUND;
  }

  memset(modulename,0,sizeof(modulename));
  memset(cmd,0,sizeof(cmd));
  memset(cmdb,0,sizeof(cmdb));
  bufbck=strdup(buf);
  rt=CMDSTATUS_NOTFOUND;
  j = sscanf(buf,"%9s %9s %[^\t\n]",modulename,cmd,cmdb);

  if (telnetparams.telnetdbg > 0)
    printf("process_command: %i words, module=%s cmd=%s, parameters= %s\n",j,modulename,cmd,cmdb);

  for (i=0; j>=2 && telnetparams.CmdParsers[i].var != NULL && telnetparams.CmdParsers[i].cmd != NULL; i++) {
    if ( (strncasecmp(telnetparams.CmdParsers[i].module,modulename,strlen(telnetparams.CmdParsers[i].module)) == 0)) {
      if (strncasecmp(cmd,"getall",7) == 0 ) {
        for(j=0; telnetparams.CmdParsers[i].var[j].varvalptr != NULL ; j++) {
          setgetvar(i,'g',telnetparams.CmdParsers[i].var[j].varname);
        }

        rt= CMDSTATUS_FOUND;
      } else if (strncasecmp(cmd,"get",3) == 0 || strncasecmp(cmd,"set",3) == 0) {
        rt= setgetvar(i,cmd[0],cmdb);
      } else {
        for (k=0 ; telnetparams.CmdParsers[i].cmd[k].cmdfunc != NULL ; k++) {
          if (strncasecmp(cmd, telnetparams.CmdParsers[i].cmd[k].cmdname,sizeof(telnetparams.CmdParsers[i].cmd[k].cmdname)) == 0) {
            telnetparams.CmdParsers[i].cmd[k].cmdfunc(cmdb, telnetparams.telnetdbg, client_printf);
            rt= CMDSTATUS_FOUND;
          }
        } /* for k */
      }/* else */
    }/* strncmp: module name test */
    else if (strncasecmp(modulename,"loop",4) == 0 ) {
      int lc;
      int f = fcntl(telnetparams.new_socket,F_GETFL);
      fcntl (telnetparams.new_socket, F_SETFL, O_NONBLOCK | f);

      for(lc=0; lc<telnetparams.loopcount; lc++) {
        char dummybuff[20];
        char tbuff[64];
        int rs;
        client_printf(CSI "1J" CSI "1;10H         " STDFMT "%s %i/%i\n",
                      get_time(tbuff,sizeof(tbuff)),lc,telnetparams.loopcount );
        process_command(bufbck+strlen("loop")+1);
        usleep(telnetparams.loopdelay * 1000);
        rs = read(telnetparams.new_socket,dummybuff,sizeof(dummybuff));

        if ( rs > 0 ) {
          break;
        }
      }

      fcntl (telnetparams.new_socket, F_SETFL, f);
      rt= CMDSTATUS_FOUND;
    } /* loop */
  } /* for i */

  free(bufbck);
  return rt;
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}

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void run_telnetsrv(void) {
  int sock;
  struct sockaddr_in name;
  char buf[TELNET_MAX_MSGLENGTH];
  struct sockaddr cli_addr;
  unsigned int cli_len = sizeof(cli_addr);
  int readc , filled;
  int status;
  int optval = 1;
  pthread_setname_np(pthread_self(), "telnet");
  set_sched(pthread_self(),0,telnetparams.priority);
  sock = socket(AF_INET, SOCK_STREAM, 0);

  if (sock < 0)
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    fprintf(stderr,"[TELNETSRV] Error %s on socket call\n",strerror(errno));

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  setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof optval);
  name.sin_family = AF_INET;

  if (telnetparams.listenaddr == 0)
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    name.sin_addr.s_addr = INADDR_ANY;
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  else
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    name.sin_addr.s_addr = telnetparams.listenaddr;

555
  name.sin_port = htons((unsigned short)(telnetparams.listenport));
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  if(bind(sock, (void *) &name, sizeof(name)))
    fprintf(stderr,"[TELNETSRV] Error %s on bind call\n",strerror(errno));
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  if(listen(sock, 1) == -1)
    fprintf(stderr,"[TELNETSRV] Error %s on listen call\n",strerror(errno));
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  using_history();
  printf("\nInitializing telnet server...\n");

  while( (telnetparams.new_socket = accept(sock, &cli_addr, &cli_len)) ) {
    printf("[TELNETSRV] Telnet client connected....\n");
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    read_history(telnetparams.histfile);
    stifle_history(telnetparams.histsize);
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571
    if(telnetparams.new_socket < 0)
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      fprintf(stderr,"[TELNETSRV] Error %s on accept call\n",strerror(errno));

    while(telnetparams.new_socket>0) {
      filled = 0;
      memset(buf,0,sizeof(buf));

      while(filled < ( TELNET_MAX_MSGLENGTH-1)) {
        readc = recv(telnetparams.new_socket, buf+filled, TELNET_MAX_MSGLENGTH-filled-1, 0);

        if(!readc)
          break;

        filled += readc;

        if(buf[filled-1] == '\n') {
          buf[filled-1] = 0;
          break;
        }
      }

      if(!readc) {
        printf ("[TELNETSRV] Telnet Client disconnected.\n");
        break;
      }

      if (telnetparams.telnetdbg > 0)
        printf("[TELNETSRV] Command received: readc %i filled %i \"%s\"\n", readc, filled ,buf);

      if (buf[0] == '!') {
        if (buf[1] == '!') {
          sprintf(buf,"%s","telnet history list");
        } else {
          HIST_ENTRY *hisentry = history_get(strtol(buf+1,NULL,0));

          if (hisentry) {
            char msg[TELNET_MAX_MSGLENGTH + sizeof(TELNET_PROMPT) +10];
            sprintf(buf,"%s",hisentry->line);
            sprintf(msg,"%s %s\n",TELNET_PROMPT, hisentry->line);
            send(telnetparams.new_socket, msg, strlen(msg), MSG_NOSIGNAL);
          }
        }
      }

      if (strlen(buf) > 2 ) {
        status=process_command(buf);
      } else
        status=CMDSTATUS_NOCMD;

      if (status != CMDSTATUS_EXIT) {
        if (status == CMDSTATUS_NOTFOUND) {
          char msg[TELNET_MAX_MSGLENGTH + 50];
          sprintf(msg,"Error: \n      %s\n is not a softmodem command\n",buf);
          send(telnetparams.new_socket, msg, strlen(msg), MSG_NOSIGNAL);
        } else if (status == CMDSTATUS_FOUND) {
          add_history(buf);
        }

        send(telnetparams.new_socket, TELNET_PROMPT, sizeof(TELNET_PROMPT), MSG_NOSIGNAL);
      } else {
        printf ("[TELNETSRV] Closing telnet connection...\n");
        break;
      }
634
    }
635

636 637
    write_history(telnetparams.histfile);
    clear_history();
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    close(telnetparams.new_socket);
    printf ("[TELNETSRV] Telnet server waitting for connection...\n");
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  }

  close(sock);
  return;
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}

/*------------------------------------------------------------------------------------------------*/
/* set_telnetmodule loads the commands delivered with the telnet server
 *
 *
650
 *
651
*/
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void exec_moduleinit(char *modname) {
  void (*fptr)(void);
  char initfunc[TELNET_CMD_MAXSIZE+9];

  if (strlen(modname) > TELNET_CMD_MAXSIZE) {
    fprintf(stderr,"[TELNETSRV] module %s not loaded, name exceeds the %i size limit\n",
            modname, TELNET_CMD_MAXSIZE);
    return;
  }
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662 663
  sprintf(initfunc,"add_%s_cmds",modname);
  fptr = dlsym(RTLD_DEFAULT,initfunc);
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665 666 667 668 669 670
  if ( fptr != NULL) {
    fptr();
  } else {
    fprintf(stderr,"[TELNETSRV] couldn't find %s for module %s \n",initfunc,modname);
  }
}
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672 673
int add_embeddedmodules(void) {
  int ret=0;
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675 676 677 678
  for(int i=0; i<telnetoptions[TELNETSRV_STATICMOD].numelt; i++) {
    ret++;
    exec_moduleinit(telnetoptions[TELNETSRV_STATICMOD].strlistptr[i]);
  }
679

680
  return ret;
681 682
}

683 684 685 686
int add_sharedmodules(void) {
  char initfunc[TELNET_CMD_MAXSIZE+9];
  void (*fptr)(void);
  int ret=0;
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688 689 690
  for(int i=0; i<telnetoptions[TELNETSRV_SHRMOD].numelt; i++) {
    sprintf(initfunc,"add_%s_cmds",telnetoptions[TELNETSRV_SHRMOD].strlistptr[i]);
    fptr = dlsym(RTLD_DEFAULT,initfunc);
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    if ( fptr != NULL) {
      fptr();
      ret++;
    } else {
      fprintf(stderr,"[TELNETSRV] couldn't find %s for module %s \n",initfunc,telnetoptions[TELNETSRV_STATICMOD].strlistptr[i]);
    }
  }
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700 701
  return ret;
}
702

703 704 705 706 707 708 709 710
int telnetsrv_autoinit(void) {
  memset(&telnetparams,0,sizeof(telnetparams));
  config_get( telnetoptions,sizeof(telnetoptions)/sizeof(paramdef_t),"telnetsrv");

  if(pthread_create(&telnetparams.telnet_pthread,NULL, (void *(*)(void *))run_telnetsrv, NULL) != 0) {
    fprintf(stderr,"[TELNETSRV] Error %s on pthread_create call\n",strerror(errno));
    return -1;
  }
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  add_telnetcmd("telnet", telnet_vardef, telnet_cmdarray);
  add_embeddedmodules();
  return 0;
715 716
}

717 718 719 720 721
/*---------------------------------------------------------------------------------------------*/
/* add_telnetcmd is used to add a set of commands to the telnet server. A module calls this
 * function at init time. the telnet server is delivered with a set of commands which
 * will be loaded or not depending on the telnet section of the config file
*/
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int add_telnetcmd(char *modulename, telnetshell_vardef_t *var, telnetshell_cmddef_t *cmd) {
  int i;

  if( modulename == NULL || var == NULL || cmd == NULL) {
    fprintf(stderr,"[TELNETSRV] Telnet server, add_telnetcmd: invalid parameters\n");
    return -1;
  }

  for (i=0; i<TELNET_MAXCMD ; i++) {
    if (telnetparams.CmdParsers[i].var == NULL) {
      strncpy(telnetparams.CmdParsers[i].module,modulename,sizeof(telnetparams.CmdParsers[i].module)-1);
      telnetparams.CmdParsers[i].cmd = cmd;
      telnetparams.CmdParsers[i].var = var;
      printf("[TELNETSRV] Telnet server: module %i = %s added to shell\n",
             i,telnetparams.CmdParsers[i].module);
      break;
    }
  }

741
  return 0;
742
}
743 744


745 746
/* function which will be called by the shared lib loader, to check shared lib version
   against main exec version. version mismatch no considered as fatal (interfaces not supposed to change)
747 748
*/
int  telnetsrv_checkbuildver(char *mainexec_buildversion, char **shlib_buildversion) {
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#ifndef PACKAGE_VERSION
#define PACKAGE_VERSION "standalone built: " __DATE__ __TIME__
#endif
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  *shlib_buildversion = PACKAGE_VERSION;

  if (strcmp(mainexec_buildversion, *shlib_buildversion) != 0) {
    fprintf(stderr,"[TELNETSRV] shared lib version %s, doesn't match main version %s, compatibility should be checked\n",
            mainexec_buildversion,*shlib_buildversion);
  }

  return 0;
760
}
761

762
int telnetsrv_getfarray(loader_shlibfunc_t  **farray) {
763 764 765 766
  *farray=malloc(sizeof(loader_shlibfunc_t));
  (*farray)[0].fname=TELNET_ADDCMD_FNAME;
  (*farray)[0].fptr=(int (*)(void) )add_telnetcmd;
  return 1;
767
}